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PONormalize whitespace in mixed-content elements, in XSLT 1.0
 

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  1. PONormalize whitespace in mixed-content elements, in XSLT 1.0
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    <p>[EDIT: Changed title to better conceptualize the question.]</p> <p>The value of the attribute <code>@xml:space</code> can be either <code>"default"</code> or <code>"preserve"</code>. XML specifies what the second means but leaves the first up to the application. (I think I have that correct.) So what if the application wants <code>default</code> to implement XSchema's <code>collapse</code>? How could XSLT 1.0 actually do this?</p> <p>I think the built-in template for processing text, that is,</p> <pre><code>&lt;xsl:template match="text()"&gt; &lt;xsl:value-of select="."/&gt; &lt;/xsl:template&gt; </code></pre> <p>would need to be replaced with something like this pseudo-code:</p> <pre><code>&lt;xsl:choose&gt; &lt;xsl:when test="../@xml:space='preserve'" &lt;xsl:value-of select="."/&gt; &lt;/xsl:when&gt; &lt;xsl:otherwise&gt; if position(.)=1 then output LTRIM(value-of(.)) if position(.)=last() then output RTRIM(value-of(.)) if position(.)= 1 and last()=1 then output normalize-space(.) &lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; </code></pre> <p>This input then:</p> <pre><code>&lt;persName&gt; The man is &lt;forename&gt;Edward&lt;/forename&gt; &lt;forename&gt;George&lt;/forename&gt; &lt;surname type="linked"&gt;Bulwer-Lytton&lt;/surname&gt;, &lt;roleName&gt;Baron Lytton of &lt;placeName&gt;Knebworth&lt;/placeName&gt; &lt;/roleName&gt; &lt;/persName&gt; </code></pre> <p>would get rendered correctly as <code>The man is Edward George Bulwer-Lytton, Baron Lytton of Knebworth</code> with the space before <code>The man</code> and after <code>Knebworth</code> trimmed and the spaces between <code>Edward</code> and <code>George</code> collapsed. (The example is from TEI.)</p> <p>[EDIT: I removed an incorrect and misleading paragraph here.]</p> <p>The XSLT 1.0 to implement that pseudo-code would need to be executed for every text node. Wouldn't that be ugly and slow? [EDIT: Or maybe not. I simplified the pseudo code. Are there fast trim routines? Is the choose really that slow?]</p> <p>Bottom line: How does one implement XSchema's collapse in XSLT 1.0 (with only browser-embedded extensions)?</p> <p>I hope I'm saying all that correctly. And I hope the code is simple. I haven't yet seen how it can be. [EDIT: Changed xs:collapse to XSchema's collapse.]</p>
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    1. COBy your rules, there should be a space before the comma in the output. If not, you need to update the question and add an exception.
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    2. COI don't see why. There is no space between the close </surname> and the comma.
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    3. CONor is there space between <surname> and "Bulwer-Lytton" and yet in output it is preceded by a space. There is no difference in the cases between Bulwer-Lytton and ", ". If the same rule applies, then both text nodes must be preceded by a space in the output, or both not.
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